Advantage Media Services Data Breach Investigation

A data breach at Advantage Media Services LLC may have put the personal information of an unknown number of individuals at risk. The breach, which took place in September 2025, was reported to multiple state attorneys general in late March 2026. If you received a notification letter from the company, you may have legal options worth exploring with an experienced data breach attorney.

What Is Advantage Media Services?

Advantage Media Services LLC, also known as AMS, is a full-service advertising and media agency. Like many companies in the marketing and media industry, AMS handles and stores significant amounts of consumer and client data as part of its day-to-day operations.

According to the company's breach notification, an unauthorized actor accessed AMS's server environment on September 8, 2025, and continued accessing it through September 9, 2025. During that roughly 24-hour window, the intruder copied data from the company's systems. AMS became aware of suspicious activity within its computer systems around that time and launched an investigation.

AMS disclosed the breach to the California Attorney General on March 31, 2026, and also submitted notifications to attorneys general in more than a dozen other states.

What Personal Information Was Exposed?

The specific types of information affected vary by individual and have not all been publicly disclosed. However, the breach is reported to have potentially involved:

• Full names
• Social Security numbers
• Dates of birth
• Home addresses
• Government-issued identification numbers
• Medical information
• Financial information

Your Legal Rights After a Data Breach

Under state breach notification statutes, businesses that own or license personal data are required to notify affected individuals without unreasonable delay when a breach is reasonably believed to cause a risk of identity theft or fraud. AMS's multi-month investigation period before notifying consumers raises questions about whether that obligation was met in a timely manner.

Why Hire The Lyon Firm?

The Lyon Firm represents individuals and families in complex data breach and privacy litigation across the country. Attorney Joe Lyon has handled cases involving some of the largest companies in the world and understands how to build strong claims on behalf of people whose sensitive information has been compromised through no fault of their own.

The Lyon Firm works on a contingency fee basis, meaning there are no upfront costs. You pay nothing unless compensation is recovered on your behalf.

If you received a breach notice from Advantage Media Services and want to understand your options, contact The Lyon Firm today for a free and confidential consultation.